The Collins Metal Shop purchased a stamping machine for $257,000 on March 1, 2017. The machine is expected to have a useful life of 10 years, a salvage value of $32,000, a production of 250,000 units, and working hours of 30,000. During 2018, Denver used the stamping machine for 2,450 hours to produce 23,450 units. From the information given, compute the book depreciation expense for 2018 under each of the following methods. a. Straight-line b. Units-of-production c. Working hours d. Double-declining-balance (without conversion to straight-line) e. Double-declining-balance (with conversion to straight-line)